Electricity and Magnetism Answers

If you hooked a battery up to a cylinder of water, what current would flow if it was sea water, and what current would flow if it was tap water?

Calculate a rough estimate of the magnitude and direction of the electric field near one of your earlobes produced by the electrons in both eyes. You can assume the charge from the electrons acts like it is all in the centre of each eyeball

Imagine sitting with two friends around a table, where all three of you have different masses. Calculate the magnitude and direction of the gravitational field in the centre of the table due to your three masses

Two objects are both negatively charged with 0.02 each and are 70 cm apart. What kind of force exist between them and how much?

Proved that in AC circuit average AC power consumed is zero.

Derive the equation of charging and discharging of capacitor (in context of the concept of
electrostatic) when DC voltage is applied?

2 mWb is to be produced in the air gap of the magnetic circuit shown in figure. How much
ampere turns the coil must provide to achieve this? Relative permeability μr
of the core material
may be assumed to be constant and equal to 5000. All the dimensions shown are in cm and the
sectional area is 25cm2
throughout

A mild steel ring having a cross sectional area of 500mm2
and a mean circumference of 400mm
has a coil of 200 turns wound uniformly around it. Calculate
a. The reluctance of the ring.
b. The current required to produce a flux of 800µWb in the ring.

What is the electrostatic force on all the electrons in one of your eyes due to all of the electrons in your other eye? Why don’t you notice this force?

Measure how high you can jump on Earth. From that you can calculate the kinetic energy you had when you started the jump. Use this kinetic energy and the general form of gravitational potential energy to determine how high you could jump on Mars